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Windows 7: Computer Shuts down while playing StarCraft II

My son is playing SCII, computer shuts down in the middle of the game. Found the case fan on desktop PC was not running, secured connection and it is now working. The same issue happened again, information after restart below.

Computer Shuts off with no warning when playing a MMOHi, I just made this account because this problem has been frustrating me for quite a while. I had to stop playing LoL because of this problem and now recently, I have attempted to play SWTOR to no prevail. This laptop is fairly new (got it last Christmas). I will be playing the game for 5 minutes...

Gaming

Computer shuts down Playing GamesHi I wanted to start this thread about my computer that shuts down as soon as certain games start.
I have an alienware Area 51 ALX
12 gb ram
amd 6990 saphire card (I have 2 but removed one and get the same problem)
I7-975
CPU is liquid cooled
1.2 kw power supply

Playing games, computer shuts offI was playing for a few hours Skyrim and my computer turned off automatically no power but my mouse lights were on.
I booted the computer and it worked fine.
But now few days had passed, I was playing left for dead 2 and in the middle of the game my computer shuts off automatically.
I tried...